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Estimates of (co)variance components and genetic parameters for growth traits of Avikalin sheep.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Prince, Leslie Leo L. Gowane, Gopal R. Chopra, Ashish Arora, Amrit L.
Spatial Coverage	India
Description	Country affiliation: India Author Affiliation: Prince LL ( Animal Genetics and Breeding Division, Central Sheep and Wool Research Institute, Avikanagar-304501, via-Jaipur, Rajasthan, India. drlleslie@gmail.com)
Abstract	(Co)variance components and genetic parameters for various growth traits of Avikalin sheep maintained at Central Sheep and Wool Research Institute, Avikanagar, Rajasthan, India, were estimated by Restricted Maximum Likelihood, fitting six animal models with various combinations of direct and maternal effects. Records of 3,840 animals descended from 257 sires and 1,194 dams were taken for this study over a period of 32 years (1977-2008). Direct heritability estimates (from best model as per likelihood ratio test) for weight at birth, weaning, 6 and 12 months of age, and average daily gain from birth to weaning, weaning to 6 months, and 6 to 12 months were 0.28 +/- 0.03, 0.20 +/- 0.03, 0.28 +/- 0.07, 0.15 +/- 0.04, 0.21 +/- 0.03, 0.16 and 0.03 +/- 0.03, respectively. Maternal heritability for traits declined as animal grows older and it was not at all evident at adult age and for post-weaning daily gain. Maternal permanent environmental effect (c(2)) declined significantly with advancement of age of animal. A small effect of c(2) on post-weaning weights was probably a carryover effect of pre-weaning maternal influence. A significant large negative genetic correlation was observed between direct and maternal genetic effects for all the traits, indicating antagonistic pleiotropy, which needs special care while formulating breeding plans. A fair rate of genetic progress seems possible in the flock by selection for all traits, but direct and maternal genetic correlation needs to be taken in to consideration.
File Format	HTM / HTML
ISSN	00494747
Issue Number	6
Volume Number	42
e-ISSN	15737438
Journal	Tropical Animal Health and Production
Language	English
Publisher	Springer
Publisher Date	2010-08-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Veterinary Medicine Discipline Tropical Medicine Breeding Methods Selection, Genetic Sheep Growth & Development Genetics Age Factors Animals Body Weight Statistics & Numerical Data Female India Least-squares Analysis Likelihood Functions Male Models, Biological Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Food Animals

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